Wait how do you know? Did I miss something lol
I think it’s a general assumption as he is now the king so that means all his other siblings died or stepped down
U can see in the first chapter right away they say his brothers pass of unknown reasons.
Ohhh I have read before the ending of S1 that hai brothers had “disappeared” and never been found so they honor their death anniversary on the same day as their father
That's what the ML believed. That's what we all believed too. But the oldest brother, (previous crown prince) came back alive and well at the end of S1. I'm sure he's central to the plot this season.
TBH… IM HAPPY THE ML kills all of them because they were all sick